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/*****************************************************************************
Copyright (c) 1995, 2016, Oracle and/or its affiliates. All Rights Reserved.
Copyright (c) 2017, 2020, MariaDB Corporation.
This program is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free Software
Foundation; version 2 of the License.
This program is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with
this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1335 USA
*****************************************************************************/
/**************************************************//**
@file os/os0thread.cc
The interface to the operating system thread control primitives
Created 9/8/1995 Heikki Tuuri
*******************************************************/
#include "univ.i"
#include "srv0srv.h"
#ifdef _WIN32
bool os_thread_eq(os_thread_id_t a, os_thread_id_t b) { return a == b; }
void os_thread_yield() { SwitchToThread(); }
os_thread_id_t os_thread_get_curr_id() { return GetCurrentThreadId(); }
#endif
/****************************************************************//**
Creates a new thread of execution. The execution starts from
the function given.
NOTE: We count the number of threads in os_thread_exit(). A created
thread should always use that to exit so thatthe thread count will be
decremented.
We do not return an error code because if there is one, we crash here. */
os_thread_t os_thread_create(os_thread_func_t func, void *arg)
{
os_thread_id_t new_thread_id;
#ifdef _WIN32
HANDLE handle;
handle = CreateThread(NULL, /* no security attributes */
0, /* default size stack */
func,
arg,
0, /* thread runs immediately */
&new_thread_id);
if (!handle) {
/* If we cannot start a new thread, life has no meaning. */
ib::fatal() << "CreateThread returned " << GetLastError();
}
CloseHandle(handle);
return((os_thread_t)new_thread_id);
#else /* _WIN32 else */
pthread_attr_t attr;
int ret = pthread_attr_init(&attr);
if (UNIV_UNLIKELY(ret)) {
fprintf(stderr,
"InnoDB: Error: pthread_attr_init() returned %d\n",
ret);
abort();
}
ret = pthread_create(&new_thread_id, &attr, func, arg);
ut_a(ret == 0);
pthread_attr_destroy(&attr);
#endif /* not _WIN32 */
return((os_thread_t)new_thread_id);
}
/** Detach and terminate the current thread. */
os_thread_ret_t os_thread_exit()
{
#ifdef UNIV_DEBUG_THREAD_CREATION
ib::info() << "Thread exits, id " << os_thread_get_curr_id();
#endif
#ifdef UNIV_PFS_THREAD
pfs_delete_thread();
#endif
#ifdef _WIN32
ExitThread(0);
#else
pthread_detach(pthread_self());
#endif
OS_THREAD_DUMMY_RETURN;
}
/*****************************************************************//**
The thread sleeps at least the time given in microseconds. */
void
os_thread_sleep(
/*============*/
ulint tm) /*!< in: time in microseconds */
{
#ifdef _WIN32
Sleep((DWORD) tm / 1000);
#elif defined(HAVE_NANOSLEEP)
struct timespec t;
t.tv_sec = tm / 1000000;
t.tv_nsec = (tm % 1000000) * 1000;
::nanosleep(&t, NULL);
#else
struct timeval t;
t.tv_sec = tm / 1000000;
t.tv_usec = tm % 1000000;
select(0, NULL, NULL, NULL, &t);
#endif /* _WIN32 */
}
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